A5017838907- GaN-based semiconductor devices and materials
- Perovskite Materials and Applications
- Conducting polymers and applications
- Ga2O3 and related materials
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- 2D Materials and Applications
- Metal and Thin Film Mechanics
- Advancements in Semiconductor Devices and Circuit Design
- Nanowire Synthesis and Applications
- Radio Frequency Integrated Circuit Design
- Acoustic Wave Resonator Technologies
- Organic Light-Emitting Diodes Research
- Semiconductor materials and interfaces
- Thin-Film Transistor Technologies
- Copper-based nanomaterials and applications
- Integrated Circuits and Semiconductor Failure Analysis
- Gas Sensing Nanomaterials and Sensors
- Photonic Crystals and Applications
- Muon and positron interactions and applications
- Advanced battery technologies research
Hong Kong Polytechnic University
2016-2025
Shenzhen Polytechnic
2019-2023
Xi'an Jiaotong University
2023
Non-fullerene acceptors based organic solar cells represent the frontier of field, owing to both materials and morphology manipulation innovations. Non-radiative recombination loss suppression performance boosting are in center cell research. Here, we developed a non-monotonic intermediate state strategy for state-of-the-art by employing 1,3,5-trichlorobenzene as crystallization regulator, which optimizes film process, regulates self-organization bulk-heterojunction manner, i.e., first...
Abstract Graded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated OSCs deliver outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence diffraction...
Abstract For organic solar cells to be competitive, the light-absorbing molecules should simultaneously satisfy multiple key requirements, including weak-absorption charge transfer state, high dielectric constant, suitable surface energy, proper crystallinity, etc. However, systematic design rule in achieve abovementioned goals is rarely studied. In this work, guided by theoretical calculation, we present a rational of non-fullerene acceptor o-BTP-eC9, with distinct photoelectric properties...
High efficiencies for organic solar cells are achieved. Two different morphology change paths revealed with both in situ and ex measurements.
Manipulating the perovskite solidification process, including nucleation and crystal growth, plays a critical role in controlling film morphology thus affects resultant device performance. In this work, facile effective ethyl alcohol (EtOH) cosolvent strategy is demonstrated with incorporation of EtOH into ink for high-performance room-temperature blade-coated solar cells (PSCs) modules. Systematic real-time crystallization studies uncover delicate structural evolutions phase-transition...
Abstract Using two structurally similar polymer acceptors in constructing high‐efficiency ternary all‐polymer solar cells is a widely acknowledged strategy; however, the focus thus far has not been on how acceptor(s) would tune aggregation of donors, and furthermore film morphology device performance (efficiency stability). Herein, it reported that matching celebrity acceptor PY‐IT donor PBQx‐TCl results enhanced H ‐ PBQx‐TCl, which can be finely tuned by controlling amount second PY‐IV....
Abstract Optimizing the interface between perovskite and transport layers is an efficient approach to promote photovoltaic performance of inverted solar cells (IPSCs). Given decades advances in bulk materials optimization, IPSCs has been pushed its limits by engineering with a power conversion efficiency (PCE) over 25% excellent stability. Herein, n‐type polymeric semiconducting material, PY‐IT, that shown remarkable organic photovoltaics, introduced as regulator ETL. Encouragingly, this...
The primary challenge in commercializing perovskite solar cells (PSCs) mainly stems from fragile and moisture-sensitive nature of halide materials. In this study, we propose an asynchronous cross-linking strategy. A multifunctional initiator, divinyl sulfone (DVS), is firstly pre-embedded into precursor solutions. DVS, also as a special co-solvent, facilitates intermediate-dominated crystallization manipulation, favouring formamidine-DVS based solvate transition. Subsequently, DVS-embedded...
Abstract Morphology is a critical factor to determine the photovoltaic performance of organic solar cells (OSCs). However, delicately fine‐tuning morphology involving only small molecules an extremely challenging task. Herein, simple, generic, and effective concentration‐induced manipulation approach demonstrated prompt both state‐of‐the‐art thin‐film BTR‐Cl:Y6 thick‐film BTR:PC 71 BM all‐small‐molecule (ASM) OSCs record level. The controlled by subtly altering prepared solution...
Abstract Perovskite solar cells (PSCs) are ideally fabricated entirely via a scalable solution process at low temperatures to realize the promise of simple manufacturing, low‐cost processing, compatibility with flexible substrates, and perovskite‐based tandem cells. However, high‐quality photoactive perovskite thin films under those processing conditions is challenge. Here, laminar air‐knife‐assisted room‐temperature meniscus coating approach that enables one control drying kinetics during...
Epitaxial growth gives the highest-quality crystalline semiconductor thin films for optoelectronic devices. Here, a universal solution-processed bottom-up quasi-epitaxial of highly oriented α-formamidinium lead triiodide (α-FAPbI3) perovskite film via two-step method is reported, in which crystal orientation α-FAPbI3 precisely controlled through synergetic effect methylammonium chloride and large-organic cation butylammonium bromide. In situ GIWAXS visualizes BA-related intermediate phase...
Extensive studies are conducted on perovskite solar cells (PSCs) with significant performance advances (mainly spin coating techniques), which have encouraged recent efforts scalable techniques for the manufacture of PSCs. However, devices fabricated by blade inferior to state-of-the-art spin-coated because power conversion efficiency (PCE) is highly dependent morphology and crystallization kinetics in controlled environment delicate solvent system engineering. In this study, based widely...
Abstract Perovskite solar cells (PSCs) represent one of the most promising emerging photovoltaic technologies due to their high power conversion efficiency. However, despite huge progress made not only in terms efficiency achieved, but also fundamental understanding relevant physics devices and issues which affect stability, there are still unresolved problems obstacles on path toward commercialization this technology. In roadmap, we aim provide a concise up date summary outstanding...
Two novel oligomers boost the 1 cm 2 device to achieve a remarkable PCE exceeding 17% using green solvent in open-air without post-treatment. In-depth situ & ex studies elucidate mechanisms of action oligomers. This work demonstrates effective guidelines for future manufacturing.
Abstract Leveraging breakthroughs in Y‐series nonfullerene acceptors (NFAs), organic solar cells (OSCs) have achieved impressive power conversion efficiencies (PCEs) exceeding 19%. However, progress advancing OSCs has decelerated due to constraints realizing the full potential of NFAs. Herein, a simple yet effective solid additive‐induced preaggregation control method employing 2‐chloro‐5‐iodopyridine (PDCI) is reported unlock Specifically, PDCI interacts predominantly with NFAs enabling...
Abstract Excess ammonium halides as composition additives are widely employed in perovskite light‐emitting diodes (PeLEDs), aiming to achieve high performance by controlling crystallinity and passivating defects. However, an in‐depth understanding of whether excess organoammonium components affect the film physical/electrical properties resultant device instability is still lacking. Here, trade‐off between stability high‐efficiency formamidinium lead iodide (FAPbI 3 )‐based PeLEDs with...
Abstract Zinc oxide is a very promising material for short‐wavelength light‐emitting devices due to its large band gap and high exciton binding energy. Although great progress has been made in recent years, p‐type doping control over native defects introduced during or after growth are still significant problems that hinder the development of efficient ZnO based optoelectronic devices. Here we demonstrate versatile method n‐type nanorods from same solution at temperature as low 90 °C, where...
We report on the systematic investigation of optoelectronic properties tin (IV) sulfide (SnS) van der Waals epitaxies (vdWEs) grown by molecular beam epitaxy (MBE) technique. Energy band simulation using commercial CASTEP code indicates that SnS has an indirect bandgap size 0.982 eV. Furthermore, our shows elemental Cu can be used as a p-type dopant for material. Growth high quality thin films is accomplished MBE technique graphene buffer layer. observed significant reduction in rocking...
Abstract Ternary strategies have attracted extensive attention due to their potential in improving power conversion efficiencies (PCEs) of single‐junction polymer solar cells (PSCs). In this work, a novel wide bandgap donor ( E g opt ≈ 2.0 eV) named PBT(E)BTz with deep highest occupied molecular orbital (HOMO) level (≈−5.73 is designed and synthesized. first incorporated as the third component into classic PBDB‐T‐SF:IT‐4F binary PSC system fabricate efficient ternary PSCs. A higher PCE...
Abstract A cryogenic process is introduced to control the crystallization of perovskite layers, eliminating need for use environmentally harmful antisolvents. This enables decoupling nucleation and phases by inhibiting chemical reactions in as‐cast precursor films rapidly cooled down immersion liquid nitrogen. The cooling followed blow‐drying with nitrogen gas, which induces uniform precipitation precursors due supersaturation residual solvents at very low temperature, while same time...
Abstract The benchmark tin oxide (SnO 2 ) electron transporting layers (ETLs) have enabled remarkable progress in planar perovskite solar cell (PSCs). However, the energy loss is still a challenge due to lack of “hidden interface” control. We report novel ligand-tailored ultrafine SnO quantum dots (QDs) via facile rapid room temperature synthesis. Importantly, QDs ETL with multi-functional terminal groups situ refines buried interfaces both and transparent electrode enhanced interface...